You want to R. That's impossible unless your W is willing to so the work she needs to do to change from cheater to good partner.
It's possible she will decide to do that work, if she realizes how fucked up her choices about her A were.
None of us here know enough about your sitch to know what will happen or to know what is best for you. You have to make your own decisions and lead your own life.
No one here can really give you much of a roadmap. All we can do is evaluate what you write and respond from our own knowledge and experience. That's very valuable, but there are always going to be nuances that just can't be communicated in a web forum. Besides that, we have a lot of differing opinions.
We can help. You still have to ... make your own decisions and lead your own life.
Getting out of infidelity starts with knowing what you want. Since you want R, I'd say it's too early to file for D, although it is NOT too early to find a good D lawyer and create a strategy.
Watch your W. If she makes changes that indicate remorse, R is possible - not certain, but possible. OTOH, her not making positive changes should be an indicator that R is likely to be impossible, and you need to adjust.
It's probable that a good IC can give you real-time feedback about your perceptions, thoughts, feelings, and thereby help you decide on a course of action. A mindful, intentional decision based on facts on the ground shows strength, no matter what the decision is.
A decision based in large part on fear does not show strength, no matter what the decision is.
*****
To be as explicit as possible, I don't think you have enough data to make a decision, given that you want R.
IMO, filing for D is going nuclear, and I wouldn't use the filing as a tactic. My reco is not to file until you're good with following through to a final decree.
Talking with a D lawyer about rights, duties, pitfalls, tactics, and strategy is definitely something you need to do now to protect yourself, because your W may, in fact, leading you down a garden path into quicksand.
If you stop wanting R, D is in your best interest.
But right now, you're thrashing around (which seems entirely normal to me), and based on what you've written, I think it's too early for you to file.
*****
What do I think your best course of action is?
Right now I think you need to process some of the fear, grief, anger, and shame out of your system.
I think you need to monitor your W's behavior to see if she is likely to change from cheater to good partner.
I think you need to come up with your requirements for R. I think you need to ask your W if she'll meet them, and I think you need to go directly to D if she won't.
I suspect that a good IC will be able to help.
*****
Let's remember that those of us who came here uncertain about what to do eventually figured out a good path for themselves.
That wasn't because SI said 'D' or 'R'. It's because we shared our thoughts and opinions, and - IMO - because we all are capable of figuring out the best course for ourselves.
You can, too, Justinn.
[This message edited by sisoon at 11:28 AM, May 2nd (Saturday)]